Model I Determinants of Potential Resorption

Unlike realized resorption that can vary widely from year to year, potential resorption remains more fixed during the lifetime of a plant. It is essentially an evolved, nutrient-specific set-point, the magnitude of which is ultimately determined for each nutrient by biochemical limitations. These biochemical limitations prevent complete evacuation of a nutrient from a senescing leaf. Nutrient recovery from structural, recalcitrant compounds may be impossible, or energetically unfeasible, and nutrients that are essential components of the enzymatic machinery responsible for disassembling foliar biochemicals may be unavailable for export.

Biochemical limitations are in turn influenced by an array of factors, most notably phy-logenetic relationships, species-specific plant characteristics related to both source-sink t

BIOCHEMICAL LIMITATIONS

PHYLOGENY (POTENTIAL RESORPTION IN PHYLOGENETIC PRECURSORS)

SPECIES-SPECIFIC SOURCE-SINK RELATIONS (RELATIVE SINK STRENGTH)

( LONG-TERM FERTILITY

POORLY-DEVELOPED

POTENTIAL RESORPTION

PHYLOGENY (POTENTIAL RESORPTION IN PHYLOGENETIC PRECURSORS)

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